Secondary battery

Abstract

A secondary battery includes an outer package member, a battery device, an external terminal, and a coupling wiring line. The battery device is placed in the outer package member and includes a first electrode and a second electrode. The external terminal is attached to the outer package member and electrically insulated from the outer package member. The coupling wiring line is electrically insulated from the outer package member and electrically coupled to each of the first electrode and the external terminal. The coupling wiring line includes a first part, a second part that overlaps with the first part, and a turning part that is curved to allow the first part and the second part to be coupled to each other.

1 . A secondary battery comprising:
 an outer package member;   a battery device placed in the outer package member and including a first electrode and a second electrode;   an external terminal attached to the outer package member and electrically insulated from the outer package member; and   a coupling wiring line electrically insulated from the outer package member and electrically coupled to each of the first electrode and the external terminal, wherein   the coupling wiring line includes a first part, a second part that overlaps with the first part, and a turning part that is curved to allow the first part and the second part to be coupled to each other.   
     
     
         2 . The secondary battery according to  claim 1 , wherein the turning part is curved to define a space inside. 
     
     
         3 . The secondary battery according to  claim 1 , wherein
 the outer package member includes a container and a cover part, the container having an opening through which the battery device is placeable, and allowing for placement of the battery device therein through the opening, the cover part closing the opening, and   the coupling wiring line is located between the cover part and the battery device.   
     
     
         4 . The secondary battery according to  claim 3 , wherein
 the cover part includes a protruding part protruding toward the battery device,   at least a portion of the first part and at least a portion of the second part are interposed between the protruding part and the battery device in a first direction, and   the turning part is interposed between a portion of the cover part other than the protruding part and the battery device in the first direction.   
     
     
         5 . The secondary battery according to  claim 4 , wherein, in the first direction, the turning part has a thickness greater than a thickness of an overlap portion of the first part and the second part. 
     
     
         6 . The secondary battery according to  claim 4 , wherein, in a plane orthogonal to the first direction, the first part extends from a first position to a second position, the first position being other than a center position of the outer package member, the second position being on a side opposite to the first position as viewed from the center position, and
 the second part extends from the second position toward the center position.   
     
     
         7 . The secondary battery according to  claim 4 , wherein
 the cover part includes a recessed part formed by the protruding part, and   the external terminal is placed in the recessed part.   
     
     
         8 . The secondary battery according to  claim 4 , wherein
 the first part has a first end part on a side opposite to the turning part, the first end part being coupled to the first electrode of the battery device, and   the second part has a second end part on a side opposite to the turning part, the second end part being coupled to a first electrode terminal that is located on a side opposite to the battery device as viewed from the cover part.   
     
     
         9 . The secondary battery according to  claim 1 , further comprising
 an insulating member covering a periphery of the coupling wiring line, wherein   a portion of the coupling wiring line is electrically insulated from each of the outer package member and the second electrode by the insulating member.   
     
     
         10 . The secondary battery according to  claim 1 , wherein the outer package member comprises a metal can. 
     
     
         11 . The secondary battery according to  claim 10 , wherein the metal can includes an electrically conductive material including one or more of iron, copper, nickel, stainless steel, an iron alloy, a copper alloy, or a nickel alloy.